Improvement in self-registering thermometer



,M. AMES. Thermometer.

Patented Sept. 10, .1867.

NFEYERS, MLITMGRPKEL. WASHINGTON. D C.

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IMPROVEMENT IN SELF-REGISTERING THERMOMETER.

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TO ALL WHOM IT MAY-CONCERN Be it known that I, MARTIN AMES, of New Ipswich, in the-county of Hillsborough, andState of New Hampshire, have invented a new and n'sefullmprovement'in Self-Registering Thermometer; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification,

in \vhich- Figure 1 represents the index and recording hands of my improved self-registering thermometer.

Figure 2 is an inside view of the metal springs, which indicate thetemperature by their contraction and expansion. I

Figure 3 is a central cross-section taken in the line a: :r, figs. -1 and 2.

Similar lettersof reference indicate corresponding parts. p n

This invention relates to an improvement in a thermometer for registering the extremes of temperature thatmay occur within any st'ated period, and consists in connecting coils of metal, in thetform of ribbon, of different capacity for contraction and expansion under the infiuenceof different degrees of heat, with a suspended needle or vernier for indicating the temperature above and below zero upon a circular graduated scale, and connected therewith two other independent hands or pointers, which are moved in opposite directions by the action of the needle, to be left at the lowest and highest point of divergence from the starting point of the needle, and thus indicate the change of the temperature that may take place within a given time.

i In a circular case, A, is secured a frame, a, for supporting theshort hollow shaft 6, that has its bearing at one end in a step, 0, upon the frame a, by which it is held in an upright-position. A metallic ribbon coil, d, is attached at its inner end to the hollow shaft b. The outer end is attached by a set-screw, e, to one end of an arm, g, that is pivoted at the other end upon the projecting step c. The set-screw e is used for adjusting the length and consequentmotion of' the coil d when the needle of the thermometer is arranged-with the index. Another metallic coil, d, is attached at its inner end tothe hollow shaft'b,-while its outer end is made fast, by soldering or otherwise, to the outer end of a similar metallic coil, 01?, the inner end of which is attached to a pin, .9, one end of which pin sets in the hollow shaft b,'while the other endproj'ec'ts through a plate, 71, in the case A, and carries the needle n, for indicating the degree of temperature shown by a scale on theoutside of the plate It, as seen in figs. 1 and 2. The index of the thermometer and the needle n are covered by a glass plate, is, in the centre of which, directly over the pin 8, is a hole, through which passes a sleeve, o,"on the inside end of which is attached a needle, 2*, that has one end bent or turned down to catch against one side of the pointer or head of the needle n, while the other end is straight, to pass freely above the needle it without touching. A pin, 1;, is run through the sleeve 0, and carries on its inside end a needle, 10, which also has one end bent to catch against the side of the needle n, while its other. endplays over it freely without catching.

The sleeve 0 and the pin 11 are both provided with milledheads, by which the needles 9' and u: may be moved and set with their bent ends to lie close against the hand of the needle 11., so that, when the rggd lc 'ttisppoved byawchange of temperature in either direction, it will carry with it one or the other otlthe needles 1: gu p rid leave it at that p ointflon t eal indicatihg thefi'dctuatioh of the needle from the starting poi tit Thh s whichever way the needle of the thermometer may move, the independent needles, one or both, will remain stationary at the points to which they may be moved, and show the fluctuation of temperature that occurs within a given period. i 7

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The independent needles 9' w, incombination with the thermometer needle 11, arranged and operating as and for the purpose described. i

2. The combination of the hollow shaft Z1, the pin a, the needle 11, and the metallic ribbon coils d d (2?, constructed, arranged, and operating as herein shown and described.

The above specification of my invention signed by me this 12th day of July, 1867.

MARTIN AMES.

Witnesses:

WM. F. MGNAMABA, ALEX. F. Romans. 

